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Special Issue Information

Dear Colleagues,

The issues and topics covered in the first volume of the Special Issue cover a wide range of scientific areas. The relationship between ore genesis and metamorphism, geochemistry of ore-forming and hydrothermal processes, detailed isotopic and mineralogical studies, and many other scientific areas allow us to significantly expand the scope of our scientific interests. The articles published in the Special Issue of 2020 do not cover all the stated problems of the specified topic, however, and hence, it is relevant to release a 2nd volume.

Magmatism, ore genesis, and metamorphism are commonly associated processes that define fundamental features of the Earth’s crustal evolution from the earliest Precambrian to Phanerozoic. Fundamentally, the need for and importance of studying the role of metamorphic processes in the formation and transformation of deposits is of great value when discussing the origin of deposits confined to varied geological settings. In synthesis, the signatures imprinted by metamorphic episodes during evolution largely indicate complicated and multistage patterns of ore-forming processes, as well as the polygenic nature of the mineralization generated by magmatic, postmagmatic, and metamorphic processes.

Rapid industrialization and expanding demand for various types of mineral raw materials require increasing rates of mining operations. The current Special Issue is dedicated to the latest achievements in geochemistry, mineralogy, and geochronology of ore and metamorphic complexes, their interrelation, and the potential for further prospecting.

Dr. Pavel A. Serov
Guest Editor

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Published Papers (2 papers)

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Research

24 pages, 46582 KiB

Open AccessArticle

Nd-Sr Isotopic Study of Magmatic Rocks and ⁴⁰Ar/³⁹Ar Dating of the Mafic Dike of the Proterozoic Ulan-Sar’dag Ophiolite Mélange (Southern Siberia, East Sayan, Middle Belt, Russia)

by Olga Kiseleva, Pavel Serov, Evgenia Airiyants, Aleksey Travin, Dmitriy Belyanin, Brain Nharara and Sergey Zhmodik

Minerals 2022, 12(1), 92; https://0-doi-org.brum.beds.ac.uk/10.3390/min12010092 - 14 Jan 2022

Cited by 2 | Viewed by 1873

Abstract

We report the first radiogenic Nd-Sr isotope data in the magmatic rocks island-arc ophiolite assemblage from the middle branch of the East Sayan ophiolite complexes to better constrain geodynamic processes in this segment of the CAOB in southern central Siberia. The magmatic rocks belong to the following geochemical types: (1) Ensimatic island-arc boninites; (2) island-arc assemblage; (3) enriched basalts of mid-ocean ridges; and (4) oceanic island-like basalts. The boninites have a positive value εNd (T), which is generated from a depleted mantle source (N-MORB). The island-arc assemblage has negative or slightly positive εNd (T) and was formed from an enriched mantle source due to the subduction of terrigenous rocks. The source of the terrigenous material was most likely the rocks of the Archean TTG (Trondhjemite Tonalite Granodiorite) complex of the Gargan block. Isotopic ratios for E-MOR and OIB-like basalts are characterized by positive or slightly negative values of εNd (T). The mafic dike, which crosscut ophiolite rocks, corresponds to OIB-like basalts. The values of εNd (T), measured ⁸⁷Sr/⁸⁶Sr and I (Sr), in the mafic dike correspond to the EM I mantle source. The E-MOR and OIB-like basalts appear to be formed in late-stage asthenospheric mantle melting via the decompression melting processes. The obtained isotope geochemical data for the E-MOR and OIB-like basalts probably indicate the mixing of island-arc melts with asthenospheric melts. We undertook ⁴⁰Ar/³⁹Ar dating of the mafic dike, which crosscut the ophiolite unit. The mafic dike has a whole-rock ⁴⁰Ar/³⁹Ar weighted mean plateau age of 799 ± 11 Ma. The dating constrains the minimum age of the ophiolite and island-arc magmatism in the region. Full article

(This article belongs to the Special Issue Ore Genesis and Metamorphism: Geology, Geochemistry, Isotopes and Mineralogy II)

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24 pages, 5354 KiB

Open AccessArticle

Paleoproterozoic Pt-Pd Fedorovo-Pansky and Cu-Ni-Cr Monchegorsk Ore Complexes: Age, Metamorphism, and Crustal Contamination According to Sm-Nd Data

by Pavel A. Serov

Minerals 2021, 11(12), 1410; https://0-doi-org.brum.beds.ac.uk/10.3390/min11121410 - 13 Dec 2021

Cited by 4 | Viewed by 2572

Abstract

This paper continues the Sm-Nd isotope geochronological research carried out at the two largest Paleoproterozoic ore complexes of the northeastern Baltic Shield, i.e., the Cu-Ni-Cr Monchegorsk and the Pt-Pd Fedorovo-Pansky intrusions. These economically significant deposits are examples of layered complexes in the northeastern part of the Fennoscandian Shield. Understanding the stages of their formation and transformation helps in the reconstruction of the long-term evolution of ore-forming systems. This knowledge is necessary for subsequent critical metallogenic and geodynamic conclusions. We applied the Sm-Nd method of comprehensive age determination to define the main age ranges of intrusion. Syngenetic ore genesis occurred 2.53–2.85 Ga; hydrothermal metasomatic ore formation took place 2.70 Ga; and the injection of additional magma batches occurred 2.44–2.50 Ga. The rock transformation and redeposited ore formation at 2.0–1.9 Ga corresponded to the beginning of the Svecofennian events, widely presented on the Fennoscandian Shield. According to geochronological and Nd-Sr isotope data, rocks of the Monchegorsk and the Fedorovo-Pansky complexes seemed to have an anomalous mantle source in common with Paleoproterozoic layered intrusions of the Fennoscandian Shield (enriched with lithophile elements, εNd values vary from −3.0 to +2.5 and ISr 0.702–0.705). The data obtained comply with the known isotope-geochemical and geochronological characteristics of ore-bearing layered intrusions in the northeastern Baltic Shield. An interaction model of parental melts of the Fennoscandian layered intrusions and crustal matter shows a small level of contamination within the usual range of 5–10%. However, the margins of the Monchetundra massif indicate a much higher level of crustal contamination caused by active interaction of parental magmas and host rock. Full article

(This article belongs to the Special Issue Ore Genesis and Metamorphism: Geology, Geochemistry, Isotopes and Mineralogy II)

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